shenzhen baichuan electronics
Model – 7117C has the following two main functions:
A.Model-7117C can measure the Fo value of a loudspeaker fully automatically, with no need for manual adjustment of the instrument. The correct Fo value of a loudspeaker is being displayed on the〝 DISPLAY PANEL〞( 14 ) in just 1 to 1.5 seconds. It has many advantages over using a voltmeter with a needle indicator for measuring the Fo value of a loudspeaker:
( a ) Easy to read; ( b ) No visual error; ( c ) High accuracy.
B. Model-7117C can be used in a production line: high-speed judging if the Fo value of every loudspeaker is within the qualified range, Judging speed is as fast as in just 0.3 to 0.7 seconds, the “ PASS / FAIL Test” functions will be indicated instantly.
Technical specification：
A. Display: Displayed in 3 ¾digits.
B. Accuracy: Fo readout error less than ± ( 1% + 1Hz )
C. Measuring Range: 4 ranges from 16Hz to 3KHz,
( a ) 16Hz – 80Hz ; ( b ) 54Hz – 270Hz. ( c ) 180Hz – 900Hz ; ( d ) 600Hz – 3KHz.
D. Fo measuring voltage added on the pre-measure loudspeaker: 1V r.m.s. ± 10%( complies with EIA standard ).
E. Can test the impedance of an under-testing loudspeaker: Divided into two ranges, which are (1) 3Ω to 18Ω; (2) 19Ωto 100Ω.
F. Measuring Speed: 〝 Fo Readout 〞in 1 to 1.5 seconds.
〝PASS / FAIL Test〞in 0.3 to 0.7 seconds.
G. Limit Setting: Both the upper & lower limits of a loudspeaker can be preset independently from 16Hz to 3KHz, and have no interference with each other.
H. Limitation in usage: Model-7117C can not be used to measure the Fo value of an air suspension loudspeaker, including those loudspeakers which are air-tight frames , since their Q.o. values are too low to measure.
Main products:
SUNLILAB AUDIO SWEEPER 7116C、 Loudspeaker Polarity Tester139B、NOISE GENERATOR 8121C、THE WEIGHTING FILTER8121FT-1, GAUSS METER 138A、IMPEDANCE METER 152A、DIGITAL HIGH-SPEED Fo METER 7117 C.